sinceramente
From LSJ
Θεοὶ μὲν γὰρ μελλόντων, ἄνθρωποι δὲ γιγνομένων, σοφοὶ δὲ προσιόντων αἰσθάνονται → Because gods perceive future things, men what is happening now, but wise men perceive approaching things
Spanish > Greek
ἀκεραίως, ἀληθευτικῶς, ἀσκήνως, αὐθεκάστως, γνησίως, εἰλικρινῶς